Thrashing machine



Aug. 28,l 192s.

F.YJ. woon THRAsHmG MACHINE Filed Dec. 26, 1925 F. J. WOOD THRASHING MACHINE Filed Dep. 26, 1925 2 Sheets-Sheet 2 lle/250W e, W a

Patented Aug. 28, 1928.

UNITED STATES PATENT AO FRANZ JQ woonoF Das MOINES, IOWA. v

FFjicE..

'rHRAsHINo MACHINE.

yApplication led December 26, 1923. Serial No. 682.739.`

' impart the desired movement to the grain.

applied power. y

My invention consists in the construction, l arrangement and combinationof the various parts of the device, whereby the objects con templated are attained, as hereinafter more fully set forth, pointed out in vmy claim,'and illustrated in the accompanying drawings,

in which:

Figure 1 shows a side elevation of a portion of a thrashing machine with my improvement applied thereto, parts of the thrashing machine being brokenr away to show portions o f the grain pan'and cleaner shoc. In this ligure the path of movement of theoperating lever is shown by dotted lines.

Figure 2 shows an enlarged, detail, side elevation, illustrating the lever for operpan and cleaner shoe vwith a minimum of an ating the grain pan and cleaner shoe and connected parts. In this figure the operating lever is shown at its center of movement, and the dotted lines show its position at its opposite limit of movement; and

4Figure 3 shows an edge elevation ofthe operating lever and connected parts, the adjacent parts of the thrashing machine being shown in section.

Referring to the accompanying drawings, I have used the reference numeral 10 to indicate part of a thrashing machine frame. 11 indicates a grain pan of ordinary construction. 12 indicates a cleaner shoe of ordinary construtcion, and 13 indicates a power shaft.

on a pivoted rocker arm 14, and the rear end of the cleaner shoe is supported .on a pivoted hanger 15.

Mounted upon the side of the frame 10 between the grain pan and the cleaner shoe i-s a bracket 16 supporting a bearing 17 for the operating lever. The operating lever comprises a bearing member 18 to receive the bearing member 17. Projecting downward- I y from the bearing member v18 is an arm 19 for the cleaner shoe, and the cleaner shoe is The front end of the grain pan is supported` pivotally connected to the lower end of'this arm' by means of the bearing member-20. EX- Y tending upwardly from the fulcrum bearing member 18 is anv arm 21 which inclines upwardly and toward the delivery end of the thrashing'machine and has an extension 22 at its upper end which inclines upwardly and forwardly relative to the member 21, as clearly shown in Figure 2. f I. Pivoted to they upper end of the arm 22 is a-bearing member 23 connected tothe grain oov pan11.` Midway between the lfulcrum and the upper end of they opera-ting' lever'there is formed an inwardly extended journal y24, upon which is mountedra wooden bearing 25,l and to this bearing are attached the eccentric rods 26. The other ends of these rods are connected to the eccentric strap 27 on the eccentric 28 which is fixed on the shaft 13.

In practical operation, when the shaft 13 is rotated the operating lever will bewroclred vand both the grainpan and the cleaner shoe will be given a reciprocating motion. When the grain pan and cleaner shoe are at one limit of their movement, as shown in Figure l, thenthe part of the operating lever that is connected tothe cleanershoe Vwill be vertical,

and the hanger 15 for the cleaner shoe will also be vertical. However, when the operating lever is in this position, a line from the fulcrum center to the upper end of the operating lever will bev inclined upwardly and toward the receiving end ofthe thrashing machine, and the supporting arm 14: will also' be inclined upwardly and toward the receiving end ofthe machine at ythe saine angle. The advantage of thisarrangement is that when the grain pan is operated it will be moved in a direction rearwardly Aand upwardly on one stroke, and downwardly and forwardly on the other'stroke, thus tending to throw the straw thereon upwardly above the grain pan during its rearwardstrokaand during the forwardstroke the pan may move under the mass ofstraw and thus progres sively move the straw through the machine.

The lower end of the operating lever hasa movement from a vertical central linewhen at one limit of its movement, to a position inf clined downwardly andtoward the l delivery end of the machine, when at its oppositelimit inclination of its supports, tends to come .to L

a position of rest at its limit of movement toward the receiving end oi the machine.

By means oit my improvement the weightV of the operating shoe eounterbalances, to,V a certain extent, the weight of the grain pan, and when the two are operated in unison the combined weights of the grain pan and cleaner shoe tend to assist in 'starting the movement oit' the grain pans from either en d of their movement. This greatly relieves the shock and jar to the machine. caused by the stopping. and stallingl of the grain pan and cleaner shoe when at their opposite limits of movement, and requires a materiallyless amount Oi? power for their operation, and this adds greatly to the durability ot the machine.

Furthermore, byconnecting the Veccentric rods to the operating` lever about midway between its ulcrum point and-upper end,vI am fV enabled to impart tothe grain pan the desired length of movement7 and to the cleaner shoe the desired length of movement for it.

` In practice I have found that this improvement provides the necessary movement for the grain pan and cleaner shoe, with a substantially reduced amount ot applied power, and that a very substantial economy has been effected in the cost-of manu-facture due to the simplicity of construction and reduced number of working parts.

The opposite side ot' v the 'grain pan is mounted upon a pivoted support like the sup port 14;, but not shown, and the Vopposite side of the cleaner shoe has la hanging` support like 15, not shown. rIhe grain pan oscillates on its supports pivoted below it, and the cleaner shoe operates on the supports pivoted 'from above. l

Iv claim as my invention:

In a thrasing machine,the combination of a vmachine Jframe, a grain pan and a cleaner shoe, said pan and said shoe being mounted to reciprocatehorizontally with their inner endsslightly spaced apart and overlapping, a lever fulcrumed between its ends to the :trame at a point between the grain pan and the cleaner shoe, one end of the lever being extended downwardly and pivotally connected to the cleaner shoe, the other end of the lever being; extended upwardly and laterally in a direction toward Vthe receiving end o the grain pan, means'ior pivotally connecting the upper end of said lever to the inner end ot said ,fri-ain pan, eccentric rods for imparting oscillatorymovement to said lever, means for pivotally connecting one end of said eccentric rods Ato said lever vati a point between the pivotal center ot said lever and'its upper end, the pivotal points of said' shoe and said eccentric rods being;` substantially in a line passing` through the pivotal center of said lever, so that when the lever is in one position ot its oscillatory movement, the weight of. the pivotal end' ofthe said eccentric rods will counterbalance the weight of said shoe, at which time the pivotalcenter off said grain pan will be substantially vertically above the pivotal center oit saidlever, and when said lever is in another position Aof its movement, the weight ot said shoe will counterbalance the weight ot said grain pan, at which'time the'pivotal connection of'said eccentric rrods will be substantially vertically above the pivot center of said lever;

Y V'rfmuvz J. woon. 

